Standard: ANSI B 18.8
Available sizes: 1.5 to 4 (5 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|
| 1.5 | 2.19 | 0.2 | 0.8 | 2.10 | 1.9 | 2.07 | 0.45 | 2 |
| 2 | 3.25 | 0.2 | 1.0 | 3.14 | 2.9 | 3.10 | 0.65 | 3 |
| 2.5 | 5.33 | 0.3 | 1.4 | 5.17 | 4.8 | 5.12 | 1 | 5 |
Standard corrosion protection for indoor and mild outdoor environments.
Salt spray: 96–200 hours | RoHS compliant (trivalent chromium)
High-performance coating for automotive, marine, and harsh environments.
Salt spray: 720–1500 hours | Recommended for grade 8.8+
Heavy-duty protection for structural and outdoor applications.
Salt spray: 500–1000 hours | Thread tolerance adjustment required
Note for high-strength fasteners (Grade 10.9, 12.9): Electroplating processes require hydrogen embrittlement relief baking (minimum 4 hours at 200°C within 4 hours of plating). Contact our engineering team for grade-specific plating recommendations.
Request detailed technical specifications, material certifications, and availability information for your application requirements. Our engineering team can provide product recommendations, custom specifications, and technical documentation.
| 3 |
| 8.45 |
| 0.4 |
| 2.0 |
| 8.22 |
| 7.8 |
| 8.15 |
| 1.6 |
| 8 |
| 4 | 12.55 | 0.6 | 2.8 | 12.28 | 11.7 | 12.18 | 2.5 | 12 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.